Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for fast distance protection for energy supply networks

A technology of protection equipment and multi-phase power supply, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, emergency protection data processing device, etc., can solve problems such as delay, and achieve the effect of preventing the danger of misjudgment

Inactive Publication Date: 2015-07-01
SIEMENS AG
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The two described methods have the disadvantage that, depending on the size of the measurement window used, a minimum number of sampled values ​​is required for the calculation of complex current and voltage values, so that a decision about the presence of a short circuit on a wire can only be made with a certain delay out

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for fast distance protection for energy supply networks
  • Method and device for fast distance protection for energy supply networks
  • Method and device for fast distance protection for energy supply networks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0090] figure 1 Lines 10 of a polyphase power supply network not shown in detail otherwise are shown. The conductor 10 is delimited at its two ends A and B by power switches 11a and 11b via which in the event of a fault the relevant phase conductor of the conductor 10 can be disconnected. For this purpose, protective devices 12a and 12b are provided at the conductor ends A and B at measuring points 15a and 15b. The current and voltage signals recorded at the respective measuring points 15a, 15b by means of the only schematically indicated current transformers 13a, 13b and voltage transformers 14a, 14b are transmitted to the protective devices 12a and 12b.

[0091] The protective devices 12 a , 12 b sample the current and voltage signals by means of A / D conversion and carry out a fault analysis of the current and voltage sampled values ​​thus produced in order to be able to detect a possible short circuit 16 on the line 10 . Such a short circuit 16 can either be a single-phas...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for detecting a short circuit on a multiphase electrical energy supply network line includes recording current and voltage sampled values and generating a fault signal upon a fault evaluation performed by an electrical protection device indicating a short circuit. Instantaneous reference voltage values are calculated from instantaneous current and voltage sampled values recorded before the short, and instantaneous comparative voltage values are calculated from instantaneous current and voltage sampled values recorded before the short and instantaneous current and voltage sampled values recorded during the short, to generate a fault signal quickly. Then a rectified reference voltage value is calculated from consecutive instantaneous reference voltage values, and a rectified comparative voltage value is calculated from consecutive instantaneous comparative voltage values. The fault signal is generated if a difference between rectified comparative voltage and rectified reference voltage values exceeds a triggering threshold value. A corresponding electrical protection device is provided.

Description

technical field [0001] The invention relates to a method for detecting a short circuit on a conductor of a polyphase power supply network with a grounded neutral point, in which current and voltage sampled values ​​at a measurement location at one end of the conductor to be monitored are recorded by an electrical protective device, And if a fault analysis of the current and voltage sampled values ​​by the electrical protection device reveals that there is a short circuit on the conductor, a first fault signal indicating a short circuit on the conductor is generated. The invention also relates to a correspondingly constructed electrical protective device. Background technique [0002] In a power supply network with a grounded center point, it must be possible to disconnect a faulty conductor particularly quickly in the event of a clear short circuit. Due to the high short-circuit power, short-circuits in such supply networks are particularly dangerous because they place high...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R31/08H02H3/40H02H3/44H02H7/26
CPCG01R31/025H02H1/0092H02H7/26G01R31/085G01R31/52
Inventor J.布鲁姆谢恩C.德茨尼斯M.科瑞特
Owner SIEMENS AG